/**
 * Copyright (c) 2012, Kelvio Matias Santos Silva All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *    * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 *    * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.blue.annotation;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * @author Kelvio Matias
 */
public class AnnotationResolverManager {

    private Map<Class<? extends Annotation>, Class<? extends AnnotationResolver>> annotationResolverMap = new HashMap<Class<? extends Annotation>, Class<? extends AnnotationResolver>>();
    private Map<Class<? extends Annotation>, AnnotationResolver> annotationResolverCache = new HashMap<Class<? extends Annotation>, AnnotationResolver>();

    /**
     *
     */
    private static class AnnotationResolverManagerHolder {

        private static final AnnotationResolverManager INSTANCE = new AnnotationResolverManager();
    }

    private AnnotationResolverManager() {
    }

    public static AnnotationResolverManager getInstance() {
        return AnnotationResolverManagerHolder.INSTANCE;
    }

    public void resolve(Object object) {
        Set<Field> fields = ReflectionFacade.getAllFields(object.getClass());
        for (Field field : fields) {
            Annotation[] annotations = field.getAnnotations();
            for (Annotation annotation : annotations) {
                if (this.annotationResolverMap.containsKey(annotation.annotationType())) {
                    if (!this.annotationResolverCache.containsKey(annotation.annotationType())) {
                        this.createAnnotarionResolverFor(annotation.annotationType());
                    }
                    this.annotationResolverCache.get(annotation.annotationType()).resolve(annotation, object, field);
                }
            }
        }
    }

    /**
     *
     * @param type
     */
    private void createAnnotarionResolverFor(Class<? extends Annotation> type) {
        try {
            this.annotationResolverCache.put(type, this.annotationResolverMap.get(type).newInstance());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    /**
     *
     * @param annotation
     * @param annotationResolverClass
     */
    public void registerAnnotationResolver(Class<? extends Annotation> annotation, Class<? extends AnnotationResolver> annotationResolverClass) {
        this.annotationResolverMap.put(annotation, annotationResolverClass);
    }
}
